I am in NW Missouri, not finding many birds, but honestly it's too hot, and too much cover. We need snow to put them in the draws and hedgerows. It's kind of hit and miss, but mostly miss. I have a farm in NW mo, saw two different coveys in the yard in the summer (different sized birds) and haven't seen them in 90 days, but haven't hunted my own place yet. I have a friend that farms about 4000 acres of perfect bird habitat, weedy draws, corn and beans, rosebushes, etc. I've hunted it twice and haven't seen a bird at all. Every ditch you go down a coyote runs out, I don't know I've ever seen them so thick, one day hunted three hours and saw six coyotes. I did see one about 400 yards away while I was putting the dog up, he is now deceased.
There is also some state land a half mile south of the farm I grew up on, I'm sure it has some birds, but it's 4000 acres of prairie grass and standing corn, there could be a hundred coveys on it, and you'd be lucky to find one. You'd have to have an army and 20 dogs to hunt it.
I'm heading to Kansas soon, I have a young dog, and 3 or four hours of no birds is hard on them. Hell, it's hard on me! I am 60, so all the years from the time I was 8 till I was 25, we shot about 3-400 birds apiece per season. It's depressing for me, I'm in tune to 10 per day, not 10 per season!
I'm beginning to think the problem is predators, there were lots of farmers reporting seeing birds in the summer, then not seeing them from the combines. There are 2 hawks for every 120 acres, along with bobcats, coyotes, and nest robbers like possums and coons. In my area, it sure isn't lack of food or cover.